Big part of the problem is the swept-bar bar mounts on the top triple, and the long forks that stop you using a top triple clamp with conventional mounts.
If you can work out a way to deal with the long forks, you could investigate something like YZ125K triples that have straight bar mounts. I couldn't believe the difference they made on my KDX.
Quad bike bars are popular if you really want a high bar.
Personally, I hate anything higher than Renthal 764s, because they make it very hard to get your weight forward, esp with the stock top triples.